Abstract: Terahertz filters are one of the important functional devices in the field of communication. U-shaped structures based on U-shaped devices have been widely used in terahertz filters due to their simple structure. Once the geometry of the traditional U-shaped filter is determined, the parameters such as the resonant frequency and steepness cannot be changed, the traditional U-shaped filter can only be used for a specific frequency band, which limits its application. In this case, this paper designs a movable cantilever array filter based on U-shaped structure. The filter uses a double-layer (the lower layer is SiO2 and the upper layer is metal Al) cantilever beam in the U-shaped structure. When temperature changes, the thermal expansion coefficients of the two materials are different and the cantilever is deformed to change the resonance, in this way it realizes dynamic adjustable control of the filter. The paper models and simulates the filter by HFSS software to achieve dynamic modulation with a resonant frequency of 0. 22 THz. In addition, based on this filter, a double-side structure of double layer material-medium-double layer material is designed to increase the steepness of the falling edge and rising edge to 921. 24% / THz and 547. 92% / THz respectively, the minimum transmission coefficient reaches 0. 0023, and the filtering effect is optimized.